Using the dance emote in any dragon transformation will spawn a pickaxe in the right front paw of the dragon. Tested on marketplace TFs, don't have ingame ones yet.
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Edit: title transformations spawn a pickaxe as well
Using <Slash> while in <Frantic> status will trigger <Blade Dance>
I notice Blade dance does not trigger during the last 5 seconds of Frantic status. Potential bug?